TWO QUESTIONS #1 has anything been done to cart electrical system just before this problem came up? #2 Have you checked "condition of batterys" as you could have some weak cells that can fool OBC into only surface charging ( short cycling )? If you bypass the OBC and charger stays on you will confirm that OBC is bad and needs replacing.

To the best of my knowledge, nothing was done to the Electrical System, the cart is new to me and has NOT been maintained.
I did use a Hydrometer on the pack and did not find any bad cells.
I was unsure if bypassing the OBC would prove anything.
Thanks, I will try the bypass and report back